A recent look at Syria and the myth of a coalition against Daesh/ISIS makes several bottom lines -
Defeating Islamo-Arab imperialism is the key.
Iran is the one waging aggression against Iraq - further illustrating the stupidity of Obama's withdrawal there.
The US can't outsource defeating the enemy and cleaning up the mess - of course that's been the reality since the First World War. It also is a driving dishonesty in Barack Obama's sham debate about Syria.
UPDATE, APRIL 21: The slow return of US forces to Iraq showcases a reality Obama and company have long denied but which reality won't let them avoid - Boots on the ground defeat Islamic imperialism.